Create bird-watcher.js

Author: MufeezaKhan

bird-watcher.js

@@ -0,0 +1,42 @@
+/**
+ * Calculates the total bird count.
+ *
+ * @param {number[]} birdsPerDay
+ * @returns {number} total bird count
+ */
+export function totalBirdCount(birdsPerDay) {
+  let count = 0;
+  for (let i = 0; i < birdsPerDay.length; i++) {
+    count+=birdsPerDay[i];
+  };
+  return count;
+}
+/**
+ * Calculates the total number of birds seen in a specific week.
+ *
+ * @param {number[]} birdsPerDay
+ * @param {number} week
+ * @returns {number} birds counted in the given week
+ */
+export function birdsInWeek(birdsPerDay, week) {
+  var startDay= (week -1) * 7;
+  var endDay= startDay + 7;
+  let count = 0;
+  for (let i=startDay; i < endDay; i++) {
+    count += birdsPerDay[i];
+  }
+  return count;
+}
+/**
+ * Fixes the counting mistake by increasing the bird count
+ * by one for every second day.
+ *
+ * @param {number[]} birdsPerDay
+ * @returns {number[]} corrected bird count data
+ */
+export function fixBirdCountLog(birdsPerDay) {
+  for (let i = 0; i < birdsPerDay.length; i+=2) {
+    birdsPerDay[i] += 1;
+  }
+  return birdsPerDay;
+}